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gerrit-public.fairphone.software / toolchain / llvm-project / b4a02798a7b19e0650369b5a4f6640e2afd62385 / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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3<html>
4<head>
Reid Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]7 <title>LLVM 2.7 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]11<div class="doc_title">LLVM 2.7 Release Notes</div>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
14 width="136" height="136">
15
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 2.7</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 2.7?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]22 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]23 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25</ol>
26
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]27<div class="doc_author">
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]28 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.7
32release.<br>
33You may prefer the
34<a href="http://llvm.org/releases/2.6/docs/ReleaseNotes.html">LLVM 2.6
35Release Notes</a>.</h1>
36
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]37<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]38<div class="doc_section">
39 <a name="intro">Introduction</a>
40</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]41<!-- *********************************************************************** -->
42
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]43<div class="doc_text">
44
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]45<p>This document contains the release notes for the LLVM Compiler
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]46Infrastructure, release 2.7. Here we describe the status of LLVM, including
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]47major improvements from the previous release and significant known problems.
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]48All LLVM releases may be downloaded from the <a
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]49href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]50
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]51<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]52release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]53web site</a>. If you have questions or comments, the <a
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]54href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
55Mailing List</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]56
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]57<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]58main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greif355f81c2008-10-14 11:00:32 +0000[diff] [blame]59current one. To see the release notes for a specific release, please see the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]60<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]62
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]63<p>FIXME: llvm.org moved to new server, mention new logo, Ted and Doug new code
64 owners.</p>
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]65
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]66</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]67
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]68
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]69<!--
70Almost dead code.
71 include/llvm/Analysis/LiveValues.h => Dan
72 lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
73 llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
Chris Lattner2bfa1672010-01-09 22:30:40 +0000[diff] [blame]74 ABCD, SCCVN, GEPSplitterPass
Chris Lattner89ea59d2010-01-16 21:25:13 +0000[diff] [blame]75 MSIL backend?
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]76 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]77-->
78
79
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]80<!-- Features that need text if they're finished for 2.7:
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]81 gcc plugin.
82 strong phi elim
83 variable debug info for optimized code
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]84 postalloc scheduler: anti dependence breaking, hazard recognizer?
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]85 metadata
86 loop dependence analysis
87 ELF Writer? How stable?
88 <li>PostRA scheduler improvements, ARM adoption (David Goodwin).</li>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]89 -->
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]90
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]91 <!-- for announcement email:
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]92 Logo web page.
93 llvm devmtg
94 compiler_rt
95 KLEE web page at klee.llvm.org
96 Many new papers added to /pubs/
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]97 Mention gcc plugin.
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]98 -->
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]99
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]100<!-- *********************************************************************** -->
101<div class="doc_section">
102 <a name="subproj">Sub-project Status Update</a>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]103</div>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]104<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]105
106<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]107<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]108The LLVM 2.7 distribution currently consists of code from the core LLVM
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]109repository (which roughly includes the LLVM optimizers, code generators
110and supporting tools), the Clang repository and the llvm-gcc repository. In
111addition to this code, the LLVM Project includes other sub-projects that are in
112development. Here we include updates on these subprojects.
Bill Wendlingf170d2e2009-03-02 04:28:57 +0000[diff] [blame]113</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]114
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]115</div>
116
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]117
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]118<!--=========================================================================-->
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]119<div class="doc_subsection">
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]120<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]121</div>
122
123<div class="doc_text">
124
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]125<p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]126
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]127<p>In the LLVM 2.7 time-frame, the Clang team has made many improvements:</p>
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]128
Daniel Dunbarc11b40f2008-10-14 23:25:09 +0000[diff] [blame]129<ul>
Daniel Dunbareb4bc7f2010-03-25 16:09:18 +0000[diff] [blame]130<li>FIXME: C++! Include a link to cxx_compatibility.html</li>
131
132<li>FIXME: Static Analyzer improvements?</li>
133
134<li>CIndex API and Python bindings: Clang now includes a C API as part of the
135CIndex library. Although we make make some changes to the API in the future, it
136is intended to be stable and has been designed for use by external projects. See
137the Clang
138doxygen <a href="http://clang.llvm.org/doxygen/group__CINDEX.html">CIndex</a>
139documentation for more details. The CIndex API also includings an preliminary
140set of Python bindings.</li>
141
142<li>ARM Support: Clang now has ABI support for both the Darwin and Linux ARM
143ABIs. Coupled with many improvements to the LLVM ARM backend, Clang is now
144suitable for use as a a beta quality ARM compiler.</li>
Bill Wendling87adbe42009-03-02 04:28:18 +0000[diff] [blame]145</ul>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]146</div>
147
148<!--=========================================================================-->
149<div class="doc_subsection">
150<a name="clangsa">Clang Static Analyzer</a>
151</div>
152
153<div class="doc_text">
154
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]155<p>Previously announced in the 2.4, 2.5, and 2.6 LLVM releases, the Clang project also
Ted Kremenekc11fae82009-02-27 07:01:32 +0000[diff] [blame]156includes an early stage static source code analysis tool for <a
157href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]158in C and Objective-C programs. The tool performs checks to find
Ted Kremenekc11fae82009-02-27 07:01:32 +0000[diff] [blame]159bugs that occur on a specific path within a program.</p>
Chris Lattnerbcffa5a2008-10-14 00:52:49 +0000[diff] [blame]160
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]161<p>In the LLVM 2.7 time-frame, the analyzer core has sprouted legs and...</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]162
163</div>
164
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]165<!--=========================================================================-->
166<div class="doc_subsection">
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]167<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]168</div>
169
170<div class="doc_text">
171<p>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]172The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]173a JVM and a CLI Virtual Machine (Microsoft .NET is an
174implementation of the CLI) using LLVM for static and just-in-time
175compilation.</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]176
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]177<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]178VMKit version ?? builds with LLVM 2.7 and you can find it on its
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]179<a href="http://vmkit.llvm.org/releases/">web page</a>. The release includes
Nicolas Geoffray54efd492008-10-15 20:25:04 +0000[diff] [blame]180bug fixes, cleanup and new features. The major changes are:</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]181
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]182<ul>
183
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]184<li>...</li>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]185
186</ul>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]187</div>
188
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]189
190<!--=========================================================================-->
191<div class="doc_subsection">
192<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
193</div>
194
195<div class="doc_text">
196<p>
197The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
198is a simple library that provides an implementation of the low-level
199target-specific hooks required by code generation and other runtime components.
200For example, when compiling for a 32-bit target, converting a double to a 64-bit
201unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
202function. The compiler-rt library provides highly optimized implementations of
203this and other low-level routines (some are 3x faster than the equivalent
204libgcc routines).</p>
205
206<p>
207All of the code in the compiler-rt project is available under the standard LLVM
208License, a "BSD-style" license.</p>
209
210</div>
211
212<!--=========================================================================-->
213<div class="doc_subsection">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]214<a name="dragonegg">DragonEgg: GCC-4.5 as an LLVM frontend</a>
215</div>
216
217<div class="doc_text">
218<p>
219The goal of <a href="http://dragonegg.llvm.org/">DragonEgg</a> is to make
220gcc-4.5 act like llvm-gcc without requiring any gcc modifications whatsoever.
Duncan Sands100d0e3c2009-10-15 08:17:44 +0000[diff] [blame]221<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a shared library (dragonegg.so)
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]222that is loaded by gcc at runtime. It ...
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]223</p>
224
225</div>
226
227
228<!--=========================================================================-->
229<div class="doc_subsection">
230<a name="mc">llvm-mc: Machine Code Toolkit</a>
231</div>
232
233<div class="doc_text">
234<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]235The LLVM Machine Code (MC) Toolkit project is ...
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]236</p>
237
238</div>
239
240
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]241<!-- *********************************************************************** -->
242<div class="doc_section">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]243 <a name="externalproj">External Open Source Projects Using LLVM 2.7</a>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]244</div>
245<!-- *********************************************************************** -->
246
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]247<div class="doc_text">
248
249<p>An exciting aspect of LLVM is that it is used as an enabling technology for
250 a lot of other language and tools projects. This section lists some of the
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]251 projects that have already been updated to work with LLVM 2.7.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]252</div>
253
254
255<!--=========================================================================-->
256<div class="doc_subsection">
257<a name="Rubinius">Rubinius</a>
258</div>
259
260<div class="doc_text">
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]261Need update.
262<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]263<p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
264for running Ruby code which strives to write as much of the core class
265implementation in Ruby as possible. Combined with a bytecode interpreting VM, it
266uses LLVM to optimize and compile ruby code down to machine code. Techniques
267such as type feedback, method inlining, and uncommon traps are all used to
268remove dynamism from ruby execution and increase performance.</p>
269
270<p>Since LLVM 2.5, Rubinius has made several major leaps forward, implementing
271a counter based JIT, type feedback and speculative method inlining.
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]272-->
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]273</p>
274
275</div>
276
277<!--=========================================================================-->
278<div class="doc_subsection">
279<a name="macruby">MacRuby</a>
280</div>
281
282<div class="doc_text">
283
284<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]285Need update.
286<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]287<a href="http://macruby.org">MacRuby</a> is an implementation of Ruby on top of
288core Mac OS X technologies, such as the Objective-C common runtime and garbage
289collector and the CoreFoundation framework. It is principally developed by
290Apple and aims at enabling the creation of full-fledged Mac OS X applications.
291</p>
292
293<p>
294MacRuby uses LLVM for optimization passes, JIT and AOT compilation of Ruby
295expressions. It also uses zero-cost DWARF exceptions to implement Ruby exception
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]296handling.--> </p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]297
298</div>
299
300
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]301<!--=========================================================================-->
302<div class="doc_subsection">
303<a name="pure">Pure</a>
304</div>
305
306<div class="doc_text">
307<p>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]308<a href="http://pure-lang.googlecode.com/">Pure</a>
309is an algebraic/functional programming language based on term rewriting.
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]310Programs are collections of equations which are used to evaluate expressions in
311a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]312lexical closures, a hygienic macro system (also based on term rewriting),
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]313built-in list and matrix support (including list and matrix comprehensions) and
314an easy-to-use C interface. The interpreter uses LLVM as a backend to
315 JIT-compile Pure programs to fast native code.</p>
316
Chris Lattner6aba4862010-03-17 17:25:49 +0000[diff] [blame]317<p>Pure versions 0.43 and later have been tested and are known to work with
318LLVM 2.7 (and continue to work with older LLVM releases >= 2.5).</p>
319
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]320</div>
321
322
323<!--=========================================================================-->
324<div class="doc_subsection">
325<a name="ldc">LLVM D Compiler</a>
326</div>
327
328<div class="doc_text">
329<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]330Need update.
331<!--
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]332<a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of
333the D Programming Language using the LLVM optimizer and code generator.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]334The LDC project works great with the LLVM 2.6 release. General improvements in
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]335this
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]336cycle have included new inline asm constraint handling, better debug info
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]337support, general bug fixes and better x86-64 support. This has allowed
338some major improvements in LDC, getting it much closer to being as
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]339fully featured as the original DMD compiler from DigitalMars.-->
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]340</p>
341</div>
342
Chris Lattnerfb23a962009-02-28 18:58:01 +0000[diff] [blame]343<!--=========================================================================-->
344<div class="doc_subsection">
345<a name="RoadsendPHP">Roadsend PHP</a>
346</div>
347
348<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]349<p>
350<a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
Chris Lattner0c72d8f2009-03-02 19:07:24 +0000[diff] [blame]351source implementation of the PHP programming
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]352language that uses LLVM for its optimizer, JIT and static compiler. This is a
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]353reimplementation of an earlier project that is now based on LLVM.
Chris Lattner6aba4862010-03-17 17:25:49 +0000[diff] [blame]354</p>
Chris Lattnerfb23a962009-02-28 18:58:01 +0000[diff] [blame]355</div>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]356
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]357<!--=========================================================================-->
358<div class="doc_subsection">
359<a name="UnladenSwallow">Unladen Swallow</a>
360</div>
361
362<div class="doc_text">
363<p>
364<a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a
365branch of <a href="http://python.org/">Python</a> intended to be fully
366compatible and significantly faster. It uses LLVM's optimization passes and JIT
Chris Lattner5b59a732010-03-18 06:52:15 +0000[diff] [blame]367compiler.
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]368</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]369</div>
370
371<!--=========================================================================-->
372<div class="doc_subsection">
373<a name="llvm-lua">llvm-lua</a>
374</div>
375
376<div class="doc_text">
377<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]378Need update.
379<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]380<a href="http://code.google.com/p/llvm-lua/">LLVM-Lua</a> uses LLVM to add JIT
381and static compiling support to the Lua VM. Lua bytecode is analyzed to
382remove type checks, then LLVM is used to compile the bytecode down to machine
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]383code.-->
384</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]385</div>
386
387<!--=========================================================================-->
388<div class="doc_subsection">
389<a name="icedtea">IcedTea Java Virtual Machine Implementation</a>
390</div>
391
392<div class="doc_text">
393<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]394Need update.
395<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]396<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
397harness to build OpenJDK using only free software build tools and to provide
398replacements for the not-yet free parts of OpenJDK. One of the extensions that
399IcedTea provides is a new JIT compiler named <a
400href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
401to provide native code generation without introducing processor-dependent
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]402code.-->
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]403</p>
404</div>
405
406
Chris Lattnerb4a02792010-03-29 17:50:39 +0000[diff] [blame^]407<!--=========================================================================-->
408<div class="doc_subsection">
409<a name="tce">TTA-based Codesign Environment (TCE)</a>
410</div>
411
412<div class="doc_text">
413<p>
414<a href="http://tce.cs.tut.fi/">TCE</a> is a toolset for designing
415application-specific processors (ASP) based on the Transport triggered
416architecture (TTA). The toolset provides a complete co-design flow from C/C++
417programs down to synthesizable VHDL and parallel program binaries. Processor
418customization points include the register files, function units, supported
419operations, and the interconnection network.</p>
420
421<p>TCE uses llvm-gcc/Clang and LLVM for C/C++ language support, target
422independent optimizations and also for parts of code generation. It generates
423new LLVM-based code generators "on the fly" for the designed TTA processors and
424loads them in to the compiler backend as runtime libraries to avoid per-target
425recompilation of larger parts of the compiler chain.</p>
426
427</div>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]428
429<!-- *********************************************************************** -->
430<div class="doc_section">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]431 <a name="whatsnew">What's New in LLVM 2.7?</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]432</div>
433<!-- *********************************************************************** -->
434
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]435<div class="doc_text">
436
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]437<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]438minor improvements. Some of the major improvements and new features are listed
439in this section.
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]440</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]441
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]442</div>
443
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]444<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]445<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]446<a name="majorfeatures">Major New Features</a>
447</div>
448
449<div class="doc_text">
450
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]451<p>LLVM 2.7 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]452
453<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]454<li>...</li>
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]455</ul>
456
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]457Extensible metadata solid.
458
459Debug info improvements: using metadata instead of llvm.dbg global variables.
460This brings several enhancements including improved compile times.
461
462New instruction selector.
463GHC Haskell ABI/ calling conv support.
464Pre-Alpha support for unions in IR.
465New InlineHint and StackAlignment function attributes
466Code generator MC'ized except for debug info and EH.
467New SCEV AA pass: -scev-aa
468Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage.
469MC encoding and disassembler apis.
470Optimal Edge Profiling?
471Instcombine is now a library, has its own IRBuilder to simplify itself.
472New llvm/Support/Regex.h API. FileCheck now does regex's
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]473Many subtle pointer invalidation bugs in Callgraph have been fixed and it now uses asserting value handles.
474MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
475Various tools like llc and opt now read either .ll or .bc files as input.
476Malloc and free instructions got removed.
477compiler-rt support for ARM.
478completely llvm-gcc NEON support.
479Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
480JIT debug information with GDB 7.0
Chris Lattner9b65c382010-03-17 18:15:52 +0000[diff] [blame]481New CodeGen Level CSE
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]482CMake can now run tests, what other improvements?
Chris Lattner9b65c382010-03-17 18:15:52 +0000[diff] [blame]483ARM/Thumb using reg scavenging for stack object address materialization (PEI).
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]484New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating,
485 changed jump threading, GVN, etc to use it which simplified them and speed
486 them up.
Chris Lattner6184f4d2010-03-17 06:42:25 +0000[diff] [blame]487Combiner-AA improvements, why not on by default?
Chris Lattner9b65c382010-03-17 18:15:52 +0000[diff] [blame]488Pre-regalloc tail duplication
489x86 sibcall optimization
490New LSR with full strength reduction mode
491The most awesome sext / zext optimization pass. ?
492
493
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]494
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]495CondProp pass removed (functionality merged into jump threading).
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]496AndersAA got removed (from 2.7 or mainline?)
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]497PredSimplify, LoopVR, GVNPRE got removed.
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]498LLVM command line tools now overwrite their output, before they would only do this with -f.
499DOUT removed, use DEBUG(errs() instead.
500Much stuff converted to use raw_ostream instead of std::ostream.
501TargetAsmInfo renamed to MCAsmInfo
502llvm/ADT/iterator.h gone.
503
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]504
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]505</div>
506
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]507<!--=========================================================================-->
508<div class="doc_subsection">
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]509<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]510</div>
511
512<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]513<p>LLVM IR has several new features for better support of new targets and that
514expose new optimization opportunities:</p>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]515
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]516<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]517<li>...</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]518</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]519
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]520</div>
521
522<!--=========================================================================-->
523<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]524<a name="optimizer">Optimizer Improvements</a>
525</div>
526
527<div class="doc_text">
528
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]529<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]530release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]531
532<ul>
533
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]534<li>...</li>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]535
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]536</ul>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]537
Chris Lattner883b8682010-03-01 19:29:17 +0000[diff] [blame]538<p>Also, -anders-aa was removed</p>
539
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]540</div>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]541
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]542
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]543<!--=========================================================================-->
544<div class="doc_subsection">
545<a name="executionengine">Interpreter and JIT Improvements</a>
546</div>
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]547
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]548<div class="doc_text">
549
550<ul>
Jeffrey Yasskin9fb8ce82010-01-29 19:10:38 +0000[diff] [blame]551<li>The JIT now <a
552href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
553to compiling eagerly</a> to avoid a race condition in the lazy JIT.
554Clients that still want the lazy JIT can switch it on by calling
555<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
Jeffrey Yasskine0913882010-02-11 01:07:39 +0000[diff] [blame]556<li>It is now possible to create more than one JIT instance in the same process.
557These JITs can generate machine code in parallel,
558although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
559still have to obey the other threading restrictions</a>.</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]560</ul>
561
562</div>
563
564<!--=========================================================================-->
565<div class="doc_subsection">
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]566<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]567</div>
568
569<div class="doc_text">
570
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]571<p>We have put a significant amount of work into the code generator
572infrastructure, which allows us to implement more aggressive algorithms and make
573it run faster:</p>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]574
575<ul>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]576
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]577<li>...</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]578</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]579</div>
580
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]581<!--=========================================================================-->
582<div class="doc_subsection">
583<a name="x86">X86-32 and X86-64 Target Improvements</a>
584</div>
585
586<div class="doc_text">
587<p>New features of the X86 target include:
588</p>
589
590<ul>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]591
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]592<li>...</li>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]593
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]594</ul>
595
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]596</div>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]597
598<!--=========================================================================-->
599<div class="doc_subsection">
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]600<a name="pic16">PIC16 Target Improvements</a>
601</div>
602
603<div class="doc_text">
604<p>New features of the PIC16 target include:
605</p>
606
607<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]608<li>...</li>
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]609</ul>
610
611<p>Things not yet supported:</p>
612
613<ul>
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]614<li>Variable arguments.</li>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]615<li>Interrupts/programs.</li>
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]616</ul>
617
618</div>
619
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]620<!--=========================================================================-->
621<div class="doc_subsection">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]622<a name="ARM">ARM Target Improvements</a>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]623</div>
624
625<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]626<p>New features of the ARM target include:
627</p>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]628
629<ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]630
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]631<li>...</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]632</ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]633
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]634
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]635</div>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]636
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]637<!--=========================================================================-->
638<div class="doc_subsection">
639<a name="OtherTarget">Other Target Specific Improvements</a>
640</div>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]641
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]642<div class="doc_text">
643<p>New features of other targets include:
644</p>
645
646<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]647<li>...</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]648</ul>
649
650</div>
651
652<!--=========================================================================-->
653<div class="doc_subsection">
654<a name="newapis">New Useful APIs</a>
655</div>
656
657<div class="doc_text">
658
659<p>This release includes a number of new APIs that are used internally, which
660 may also be useful for external clients.
661</p>
662
663<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]664<li>...</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]665</ul>
666
667
668</div>
669
670<!--=========================================================================-->
671<div class="doc_subsection">
672<a name="otherimprovements">Other Improvements and New Features</a>
673</div>
674
675<div class="doc_text">
676<p>Other miscellaneous features include:</p>
677
678<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]679<li>...</li>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]680</ul>
681
682</div>
683
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]684
685<!--=========================================================================-->
686<div class="doc_subsection">
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]687<a name="changes">Major Changes and Removed Features</a>
688</div>
689
690<div class="doc_text">
691
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]692<p>If you're already an LLVM user or developer with out-of-tree changes based
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]693on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]694from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]695
696<ul>
Jeffrey Yasskin914050b2010-02-09 23:03:44 +0000[diff] [blame]697<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
698if you have it installed. This makes it more likely that an LLVM built on one
699system will work when copied to a similar system. To use <tt>libffi</tt>,
700configure with <tt>--enable-libffi</tt>.
701</li>
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]702</ul>
703
704
705<p>In addition, many APIs have changed in this release. Some of the major LLVM
706API changes are:</p>
707
708<ul>
Jeffrey Yasskin4a8b1da2010-01-28 01:41:20 +0000[diff] [blame]709<li><tt>ModuleProvider</tt> has been <a
710href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
711and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
712Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
713replace <tt>getBitcodeModuleProvider</tt> with
714<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
715functions that used to accept <tt>ModuleProvider</tt>. Clients who
716wrote their own <tt>ModuleProvider</tt>s will need to derive from
717<tt>GVMaterializer</tt> instead and use
718<tt>Module::setMaterializer</tt> to attach it to a
719<tt>Module</tt>.</li>
720
721<li><tt>GhostLinkage</tt> has given up the ghost.
722<tt>GlobalValue</tt>s that have not yet been read from their backing
723storage have the same linkage they will have after being read in.
724Clients must replace calls to
725<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
726<tt>GlobalValue::isMaterializable</tt>.</li>
Daniel Dunbar1e96fca2010-02-10 04:09:52 +0000[diff] [blame]727
728<li>FIXME: Debug info has been totally redone. Add pointers to new APIs. Substantial caveats about compatibility of .ll and .bc files.</li>
729
Daniel Dunbar3e255da2010-02-14 01:47:19 +0000[diff] [blame]730<li>The <tt>llvm/Support/DataTypes.h</tt> header has moved
731to <tt>llvm/System/DataTypes.h</tt>.</li>
732
Duncan Sands80c430a2010-02-17 17:20:17 +0000[diff] [blame]733<li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>,
734<tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed
735<tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>,
736<tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li>
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]737</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]738
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]739</div>
740
741
742
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]743<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]744<div class="doc_section">
745 <a name="portability">Portability and Supported Platforms</a>
746</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]747<!-- *********************************************************************** -->
748
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]749<div class="doc_text">
750
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]751<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]752
753<ul>
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]754<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]755 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
756 systems).</li>
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]757<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]758 and 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]759<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]760<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
761 support is available for native builds with Visual C++).</li>
Chris Lattner51948622009-10-16 16:30:58 +0000[diff] [blame]762<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]763<li>Alpha-based machines running Debian GNU/Linux.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]764</ul>
765
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]766<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]767to the machine and operating system on which it is built. However, minor
768porting may be required to get LLVM to work on new platforms. We welcome your
769portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]770
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]771</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]772
773<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]774<div class="doc_section">
775 <a name="knownproblems">Known Problems</a>
776</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]777<!-- *********************************************************************** -->
778
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]779<div class="doc_text">
780
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]781<p>This section contains significant known problems with the LLVM system,
Chris Lattner2a092392008-11-10 05:40:34 +0000[diff] [blame]782listed by component. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]783href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]784there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]785
Chris Lattner6aba4862010-03-17 17:25:49 +0000[diff] [blame]786<ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]787<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
788using the stock GCC 3.x.x series 'out the box',
Chris Lattner6e41c792009-11-03 21:50:09 +0000[diff] [blame]789See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]790However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
791for x86/x86-64 has been made available from the third party AuroraUX Project
792that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
793</ul>
794
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]795</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]796
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]797<!-- ======================================================================= -->
798<div class="doc_subsection">
799 <a name="experimental">Experimental features included with this release</a>
800</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]801
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]802<div class="doc_text">
803
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]804<p>The following components of this LLVM release are either untested, known to
805be broken or unreliable, or are in early development. These components should
806not be relied on, and bugs should not be filed against them, but they may be
807useful to some people. In particular, if you would like to work on one of these
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]808components, please contact us on the <a
809href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]810
811<ul>
Wesley Peck3aa84e52010-03-18 14:31:30 +0000[diff] [blame]812<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
813 backends are experimental.</li>
Bill Wendling89cd82f2009-03-02 07:54:14 +0000[diff] [blame]814<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]815 supported value for this option. The MachO writer is experimental, and
816 works much better in mainline SVN.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]817</ul>
818
819</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]820
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]821<!-- ======================================================================= -->
822<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]823 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]824</div>
825
826<div class="doc_text">
827
828<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]829 <li>The X86 backend does not yet support
830 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
831 floating point stack</a>. It supports the 'f' and 't' constraints, but not
832 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]833 <li>The X86 backend generates inefficient floating point code when configured
834 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]835 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]836 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
837 runtime currently due
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]838 to <a href="http://llvm.org/PR2255">several</a>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]839 <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
840 the
841 'u' inline assembly constraint and for X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]842 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]843 <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]844 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]845</ul>
846
847</div>
848
849<!-- ======================================================================= -->
850<div class="doc_subsection">
851 <a name="ppc-be">Known problems with the PowerPC back-end</a>
852</div>
853
854<div class="doc_text">
855
856<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]857<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]858compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]859</ul>
860
861</div>
862
863<!-- ======================================================================= -->
864<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]865 <a name="arm-be">Known problems with the ARM back-end</a>
866</div>
867
868<div class="doc_text">
869
870<ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]871<li>Support for the Advanced SIMD (Neon) instruction set is still incomplete
872and not well tested. Some features may not work at all, and the code quality
873may be poor in some cases.</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]874<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]875processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]876results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]877<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]878</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]879</ul>
880
881</div>
882
883<!-- ======================================================================= -->
884<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]885 <a name="sparc-be">Known problems with the SPARC back-end</a>
886</div>
887
888<div class="doc_text">
889
890<ul>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]891<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]892 support the 64-bit SPARC ABI (-m64).</li>
893</ul>
894
895</div>
896
897<!-- ======================================================================= -->
898<div class="doc_subsection">
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]899 <a name="mips-be">Known problems with the MIPS back-end</a>
900</div>
901
902<div class="doc_text">
903
904<ul>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]905<li>64-bit MIPS targets are not supported yet.</li>
906</ul>
907
908</div>
909
910<!-- ======================================================================= -->
911<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]912 <a name="alpha-be">Known problems with the Alpha back-end</a>
913</div>
914
915<div class="doc_text">
916
917<ul>
918
919<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
920appropriate nops inserted to ensure restartability.</li>
921
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]922</ul>
923</div>
924
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]925<!-- ======================================================================= -->
926<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]927 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]928</div>
929
930<div class="doc_text">
931
932<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]933<li><a href="http://llvm.org/PR802">The C backend has only basic support for
934 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]935<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
936 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif75b2f762009-03-02 12:02:51 +0000[diff] [blame]937 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]938<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands3aa36732009-02-25 11:51:54 +0000[diff] [blame]939<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]940</ul>
941
942</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]943
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]944
945<!-- ======================================================================= -->
946<div class="doc_subsection">
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]947 <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]948</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]949
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]950<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]951
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]952<p>The only major language feature of GCC not supported by llvm-gcc is
953 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
954 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]955 supported on some targets (these are used when you take the address of a
956 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]957
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]958<p>If you run into GCC extensions which are not supported, please let us know.
959</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]960
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]961</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]962
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]963<!-- ======================================================================= -->
964<div class="doc_subsection">
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]965 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
966</div>
967
968<div class="doc_text">
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]969<ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]970<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]971 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
972 tools/gfortran component for details.</li>
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]973</ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]974</div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]975
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]976<!-- ======================================================================= -->
977<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]978 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]979</div>
980
981<div class="doc_text">
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]982The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
983technology, and problems should be expected.
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]984<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]985<li>The Ada front-end currently only builds on X86-32. This is mainly due
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]986to lack of trampoline support (pointers to nested functions) on other platforms.
987However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]988which does support trampolines.</li>
989<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]990This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
991exception handling, which is used internally by the compiler.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]992Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sandsaef747f2008-10-13 17:27:23 +0000[diff] [blame]993<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
994and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]995(c380004 also fails with gcc-4.2 mainline).
996If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
997causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sands2dbb00e2009-03-02 16:35:57 +0000[diff] [blame]998<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]999<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1000<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1001crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1002<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
1003or finish at a non-byte offset</a> in a record. Workaround: do not pack records
1004or use representation clauses that result in a field of a non-discrete type
1005starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]1006<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
1007'main' as generated by the Ada binder to be invalid</a>.
1008Workaround: hand edit the file to use pointers for <tt>argv</tt> and
1009<tt>envp</tt> rather than integers.</li>
1010<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
1011ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1012</ul>
1013</div>
1014
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1015<!-- ======================================================================= -->
1016<div class="doc_subsection">
1017 <a name="ocaml-bindings">Known problems with the O'Caml bindings</a>
1018</div>
1019
1020<div class="doc_text">
1021
1022<p>The <tt>Llvm.Linkage</tt> module is broken, and has incorrect values. Only
1023<tt>Llvm.Linkage.External</tt>, <tt>Llvm.Linkage.Available_externally</tt>, and
1024<tt>Llvm.Linkage.Link_once</tt> will be correct. If you need any of the other linkage
1025modes, you'll have to write an external C library in order to expose the
1026functionality. This has been fixed in the trunk.</p>
1027</div>
1028
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1029<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1030<div class="doc_section">
1031 <a name="additionalinfo">Additional Information</a>
1032</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1033<!-- *********************************************************************** -->
1034
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1035<div class="doc_text">
1036
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]1037<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]1038href="http://llvm.org">LLVM web page</a>, in particular in the <a
1039href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]1040contains versions of the API documentation which is up-to-date with the
1041Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]1042You can access versions of these documents specific to this release by going
1043into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1044
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1045<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]1046us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]1047lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1048
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1049</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1050
1051<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1052
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1053<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1054<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]1055 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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